Speed-changing device.



J. RIDDELL.

SPEED CHANGING DEVICE.

APPLICATION FILED JULY 6, 1905.

Patented Oct. 27, 1908.

m xx

/nventor: John P/dde/l.

UNITED STATES PATENT OFFICE.

i U i i.\' RIDDELL, OF SGHENECTADY, NEW YORK,- ASSIGNOR TO GENERALELECTRIC COMPANY,

A CORPORATION OF NEW YORK. I

Specification of-Letters Patent.

Patented oct 27, 1908.

Original application filed July 9, 1904, Serial No'. 215,882. Dividedand this application filed July 6, 1905.

Serial No. 268,325.

To all whom awa concern:

Be it known that 1, JOHN RIDDELL, a citizen of the United States,residing at Schenectady, in the county of Schenectady and State of NewYork, haveinvented certain new and useful Improvements in Speed-Changing Devices, of which the following is a specification. I

The present application is a division of my former application, SerialNumber 215,882, filed July 9, 1904, for a speed-changing device, and theinvention herein described and claimed relates to the arrangement ofexpansible pulleys and the means for varying their effective diametersapplicable to such speed-changing device, and has for its objecteprovision of a compact and highly-efficient meansfor effecting thechanges-of adjustment of the pulleys with facility.

In carrying out my invention, I mount upon hollow arallel-supportedshafts two expansible pul eys, each consisting of similar halves havingintermatching 'ribs and grooves, the lefthand half of one pulley and theright-hand half of the other being secured to its respective shaft whilethe other halves of said pulleys are adapted-to be moved axially withrespect thereto by devices extending into the hollow shaftsand actuatedby means external thereof. The pulleys'are connected by an endless beltor-band which engages and is held in alinement bythe grooves formed bythe opposing inclined faces of the intermatching ribs.

For a more complete understanding of the invention, reference may bemade to the following detailed description and-to the ac oompanyingdrawing forming a part of this specification in which,

Figure 1 is a part lan and part horizontal section of a s eed-c angingdevice .wi'th an expansible pu ley. arrangement embodying myinventionapplied thereto; Fig. 2 is an n'aledtwo parallel shafts 3, 4with axial bores enlarged seotionof one ofthe fpulleys and its adjustingmeans; Fig. 3 is a ont elevation of one-half of a pulley; and Figf-4 isa crosssection taken on line 4-4 of Fig. 1, showing the arrangement ofgears at the left-hand end of the speed-changingdevioe.

In suitable bearing blocks. 1, 2 are jour- 5 in their right-hand ends,and on these each consisting of two similar parts 8, 9, 10,

shafts are mounted expansible pulleys 6, 7

11 havi: .g i: .termatchi; .g ribs 12 ard grooves 13. The right-handpart 9 of pulley 6 ad the left-ha: .d part 10 of pulley 7 are rigidlycor'nectedto theirrespective shafts 3 and 4 by drivt gjoizits or othersuitable niea; s, aid the other members 8 and 11, are moflu ted thereonto slide freely toward and from the fixed members 9 and 10. The objectof this inverse arrangement of the'fixed and slidit .g members of the-pulleys is to preserve the transverse alinemeiit of the grooves formedby the opposing halves of the pulleys throughout the travel ofthesliding members so that the belt or band connecti; .g them will not tendto crowd to one side or pull out of the grooves.

The means for sliding each of the movable members 8 and 11 3.101% itsshaft co: .sists of a threaded sleeve 14 located inside of the shaft andengaging a segmental nut 15 fixed in the movable member and extendilgthrough a longitudinal slot 16- in the shaft. The outer end of thethreaded sleeve 14 isprovided with a swivel head 17 free to turn betweenthe outer end of the shaft and a flanged nut 18 threaded to the outsideof the shaft. The means for rotating the threaded sleeve 14, independentof the shaft, consists of a screw rod 19 threaded to theinside of thesleeve. and having a double or much shar er pitch than the thread on theoutside of t e sleeve so that by applying a 'force along the axis of therod rotary movement will be produced in I the sleeve. The inner end ofthe rod 19 carries a transverse block 20 so feathered in 1011- gitudinalgrooves 21 cut in opposite sldes of ders 23 which engage opposite sidesof the cross-head. The head 22 is caused to move axially of the shaftsby a lead screw 24 journaled therein at its center and engaging astationary threaded part on the bearing block 2.

The pulleys fi and 7 are connected by an endless belt 25, V preferablyof triangular shape. l lVy expansible p'ulle'y' arrangement is shown inFig. 1 applied to a hoisting device 26 driven by an induction motorhaving a drum 27 carrying the field magnet and provided with end sleeves28, 29 journaled upon shaft 3, and an armature 30 splined to the shaft 3within the drum.- The sleeve 29 carries a spur gear 31 which meshes witha smaller spur gear 32 fixed to the shaft 4, and sleeve 28 carries aspur gear 33 which meshes with'two long pinions 34 journaled on stubshafts 35 at opposite ends of rotary head 36 journaled upon shaft 3andrigidly connected to a small gear 37 which meshes with a larger gear38 on the shaft of the hoisting device 26. The shaft 3 has fixed theretobetween the gear 33 and the head 36- a. gear 39 somewhat smaller thangear 33 which meshes with idler gears 40 carried by stub shafts on thehead 36 and-meshing with the long pinio1-s 34.

Assuming that the 'gears 33 and 39 have the same ratio as gears 31 and32 and the expansible pulleys to be in the positions shown in Fig. 1with equal effective diameters then upon excitation of the motor, thedrum 27 andarmature 30 will rotate in opposite directions at suchrelative speeds as to produce equal and opposite peripheral speeds inthe gears 33 and 39, and asa consequence the long pinions 34 will merelyrotate on their axes without tending to produce planetary action thereinand the hoisting drum remains at rest," but upon manipulation of thelead screw in one direction or the other the effects ive diameters ofthe expansible pulleys are made unequal and planetary motion in thepinions 34 takes place producing a driving action upon the hoisting drumto raise or lower according to whether the effective diameter of pulley6 is made greater or less than the effective diameter of pulley 7 by theadjustment of the lead screw 24.

I do not desire to restrict myself to'the particular construction orarrangement of 1 lllOIl.

parts herein described and shqhvn, since it is apparent that they maybe, changed and modified without departing-from my inven- What I claimas new and desire to secure by LettersPatent of the United States, is,

1. The combination with /a tubular shaft having a longitudinal slot, ofa pulley composed of similar halves having intermatching radial ribs andgrooves, one art being fixed to the shaft and the other oose thereon, ascrew-threaded sleeve rotatably secured in said shaft, asegment-nutsecured to the movable half of the pulley and passing through said slotinto engagementwith the sleeve, and means for rotating said sleeve. v

2. The'combination with a tubular shaft having a longitudinal slot, of apulley'composed of similar halves having inter-matching 'radial'ribs andgrooves, one part being fixed to the shaft and the other loose thereon,a

screw-threadedsleeve rotatably secured in said shaft, a segment-nutsecured to the movable half of the pulley and passing through said slotinto engagement with the sleeve, and means" for rotating said sleeveconsisting of a longitudinally movable rod having screw threads of longpitch meshing with similar threads in the inside of said sleeve.

3. The combination with a tubular shaft having a longitudinal slot, alongitudinally movable partmountedon said shaft, an ex-- ternally screwthreaded sleeve mounted within said shaft and free to rotate therein butheld from longitudinal movement relatively thereto, means 0 erativelyconnecting said movable partan the screw thread of said sleeve, andmeans for rotating said sleeve independently of said shaft.

In witness whereof, I have hereunto sol.

my hand this 5th day of July, 1905.

JOHN RIDDELL.

Witnesses:

BENJAMIN B. l'lULL, HELEN ORFORD.

